<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: Page.class.php 2712 2012-02-06 10:12:49Z liu21st $


class Page {
	// 分页栏每页显示的页数
	public $rollPage = 5;
	// 页数跳转时要带的参数
	public $parameter;
	// 默认列表每页显示行数
	public $listRows = 20;
	// 起始行数
	public $firstRow;
	// 分页总页面数
	protected $totalPages;
	// 总行数
	protected $totalRows;
	// 当前页数
	protected $nowPage;
	// 分页的栏的总页数
	protected $coolPages;
	// 分页显示定制
	protected $config = array ('header' => '条记录', 'prev' => '上一页', 'next' => '下一页', 'first' => '第一页', 'last' => '最后一页', 'theme' => ' %totalRow% %header% %nowPage%/%totalPage% 页 %upPage% %downPage% %first%  %prePage%  %linkPage%  %nextPage% %end%' );
	// 默认分页变量名
	protected $varPage;
	
	/**
     +----------------------------------------------------------
	 * 架构函数
     +----------------------------------------------------------
	 * @access public
     +----------------------------------------------------------
	 * @param array $totalRows  总的记录数
	 * @param array $listRows  每页显示记录数
	 * @param array $parameter  分页跳转的参数
     +----------------------------------------------------------
	 */
	public function __construct($totalRows, $listRows = '', $parameter = '') {
		$this->totalRows = $totalRows;
		$this->parameter = $parameter;
		$this->varPage = C ( 'VAR_PAGE' ) ? C ( 'VAR_PAGE' ) : 'p';
		if (! empty ( $listRows )) {
			$this->listRows = intval ( $listRows );
		}
		$this->totalPages = ceil ( $this->totalRows / $this->listRows ); //总页数
		$this->coolPages = ceil ( $this->totalPages / $this->rollPage );
		$this->nowPage = ! empty ( $_GET [$this->varPage] ) ? intval ( $_GET [$this->varPage] ) : 1;
		if (! empty ( $this->totalPages ) && $this->nowPage > $this->totalPages) {
			$this->nowPage = $this->totalPages;
		}
		$this->firstRow = $this->listRows * ($this->nowPage - 1);
	}
	
	public function setConfig($name, $value) {
		if (isset ( $this->config [$name] )) {
			$this->config [$name] = $value;
		}
	}
	
	/**
     +----------------------------------------------------------
	 * 分页显示输出
     +----------------------------------------------------------
	 * @access public
     +----------------------------------------------------------
	 */
	public function show() {
		if (0 == $this->totalRows)
			return '';
		$p = $this->varPage;
		$nowCoolPage = ceil ( $this->nowPage / $this->rollPage );
		$url = $_SERVER ['REQUEST_URI'] . (strpos ( $_SERVER ['REQUEST_URI'], '?' ) ? '' : "?") . $this->parameter;
		$parse = parse_url ( $url );
		if (isset ( $parse ['query'] )) {
			parse_str ( $parse ['query'], $params );
			unset ( $params [$p] );
			$url = $parse ['path'] . '?' . http_build_query ( $params );
		}
		//上下翻页字符串
		$upRow = $this->nowPage - 1;
		$downRow = $this->nowPage + 1;
		if ($upRow > 0) {
			$upPage = "<a href='" . $url . "&" . $p . "=$upRow'>" . $this->config ['prev'] . "</a>";
		} else {
			$upPage = "";
		}
		
		if ($downRow <= $this->totalPages) {
			$downPage = "<a href='" . $url . "&" . $p . "=$downRow'>" . $this->config ['next'] . "</a>";
		} else {
			$downPage = "";
		}
		// << < > >>
		if ($nowCoolPage == 1) {
			$theFirst = "";
			$prePage = "";
		} else {
			$preRow = $this->nowPage - $this->rollPage;
			$prePage = "<a href='" . $url . "&" . $p . "=$preRow' >上" . $this->rollPage . "页</a>";
			$theFirst = "<a href='" . $url . "&" . $p . "=1' >" . $this->config ['first'] . "</a>";
		}
		if ($nowCoolPage == $this->coolPages) {
			$nextPage = "";
			$theEnd = "";
		} else {
			$nextRow = $this->nowPage + $this->rollPage;
			$theEndRow = $this->totalPages;
			$nextPage = "<a href='" . $url . "&" . $p . "=$nextRow' >下" . $this->rollPage . "页</a>";
			$theEnd = "<a href='" . $url . "&" . $p . "=$theEndRow' >" . $this->config ['last'] . "</a>";
		}
		// 1 2 3 4 5
		$linkPage = "";
		for($i = 1; $i <= $this->rollPage; $i ++) {
			$page = ($nowCoolPage - 1) * $this->rollPage + $i;
			if ($page != $this->nowPage) {
				if ($page <= $this->totalPages) {
					$linkPage .= "&nbsp;<a href='" . $url . "&" . $p . "=$page'>&nbsp;" . $page . "&nbsp;</a>";
				} else {
					break;
				}
			} else {
				if ($this->totalPages != 1) {
					$linkPage .= "&nbsp;<span class='current'>" . $page . "</span>";
				}
			}
		}
		$pageStr = str_replace ( array ('%header%', '%nowPage%', '%totalRow%', '%totalPage%', '%upPage%', '%downPage%', '%first%', '%prePage%', '%linkPage%', '%nextPage%', '%end%' ), array ($this->config ['header'], $this->nowPage, $this->totalRows, $this->totalPages, $upPage, $downPage, $theFirst, $prePage, $linkPage, $nextPage, $theEnd ), $this->config ['theme'] );
		return $pageStr;
	}

}